The purpose of the CONFERS Lexicon Working Group (CLWG) is to discuss and refine the terms and language used by CONFERS in the discussion of rendezvous and proximity operations (RPO) and on-orbit servicing (OOS) missions. The CLWG meets monthly to discuss updates and additions to the CONFERS lexicon. Attachment A contains the list of terms under consideration in the CLWG. The CLWG aims to provide consistency within CONFERS and other international organizations of RPO OOS terminology. Terms in the lexicon generally have dictionary definitions, but in addition have more specialized usage in the context of on-orbit servicing and appear in this lexicon to clarify that specialized usage. As such, the CLWG presents the defined OOS / RPO terminology for CONFERS below: